JP7260066B2 - Connection structure between power supply system and connection terminal and bus bar - Google Patents

Description

The present invention relates to a connection structure between bus bars and terminals, and a power supply system including this connection structure.

Patent Literature 1 describes a configuration in which a plurality of power supply modules are connected with two types of bus bars. A plurality of power supply modules are arranged in a predetermined pattern. Two types of bus bars are selectively used according to the shape of the connection points in this arrangement pattern.

Japanese Unexamined Patent Application Publication No. 2013-5570

However, in the configuration described in Patent Literature 1, there are a plurality of types of bus bars with different configurations and different mounting methods, which complicates the connection work.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a connection structure between a bus bar and a terminal that facilitates connection workability.

A power supply system of the present invention includes a plurality of power supply modules arranged in order of a first power supply module, a second power supply module, and a third power supply module in a predetermined direction, and a first bus bar and a second bus bar. The first bus bar connects the first power module and the second power module. The second bus bar connects the second power module and the third power module. The first power supply module has a first connection terminal having a first surface perpendicular to the predetermined direction. The second power supply module has a second connection terminal having a second surface orthogonal to the predetermined direction. The third power supply module has a third connection terminal having a third surface perpendicular to the predetermined direction.

The first bus bar and the second bus bar are configured such that the first terminal portion and the second terminal portion have a pair of surfaces facing each other, and the first terminal portion is arranged such that the surface of the first terminal portion and the surface of the second terminal portion face each other. and a joint portion that connects the portion and the second terminal portion. In the first bus bar, the surface of the first terminal portion of the first bus bar is in contact with the first surface of the first connection terminal, and the surface of the second terminal portion of the first bus bar is directly or directly in contact with the second surface of the second connection terminal. They are arranged so as to be in direct contact with each other. In the second bus bar, the surface of the first terminal portion of the second bus bar is in direct or indirect contact with the second surface of the second connection terminal, and the surface of the second terminal portion of the second bus bar is the second surface of the third connection terminal. It is arranged to connect directly or indirectly to the three sides. In the direction parallel to the first surface, the joint portion of the first bus bar and the joint portion of the second bus bar are arranged at positions sandwiching the first connection terminal, the second connection terminal, and the third connection terminal.

In this configuration, a plurality of power supply modules are connected by a plurality of bus bars having the same positional relationship between the first terminal portion and the second terminal portion.

According to the present invention, it is possible to facilitate the connection work between the bus bar and the terminal.

FIG. 1 is a five-sided view of the busbar according to the first embodiment. FIG. 2 is an external perspective view of the busbar according to the first embodiment. FIG. 3 is a diagram showing part of the configuration of the power supply system according to the first embodiment of the present invention. FIG. 4 is a diagram showing a connection terminal forming portion in a battery module used in a power supply system. FIG. 5 is an enlarged view of the connection structure between the busbar and the connection terminal. FIG. 6 is a diagram showing part of another configuration of the power supply system according to the first embodiment of the present invention. FIG. 7 is a five-sided view of the bus bar according to the second embodiment. FIG. 8 is a diagram illustrating an example of a connection mode of busbars according to the second embodiment. FIG. 9 is a five-sided view of the bus bar according to the third embodiment.

(First embodiment)
A power supply system according to a first embodiment of the present invention will be described with reference to the drawings. In this embodiment, a power supply system will be described as an example. However, if a connection structure is provided in which a plurality of power supply modules arranged at predetermined intervals are connected by a plurality of bus bars, the following configurations and effects can be applied not only to the power supply system.

(Structure of bus bar 10)
FIG. 1 is a five-sided view of the busbar according to the first embodiment. 1(A) is a first plan view, FIG. 1(B) is a first side view, FIG. 1(C) is a second plan view, and FIG. 1(D) is a second plan view. It is two side views, and FIG.1(E) is a 3rd side view. FIG. 2 is an external perspective view of the busbar according to the first embodiment.

As shown in FIGS. 1 and 2 , the busbar 10 includes a first terminal portion 11 , a second terminal portion 12 and a joint portion 13 . The first terminal portion 11 and the second terminal portion 12 are connected by a joint portion 13 . The first terminal portion 11, the second terminal portion 12, and the joint portion 13 are integrally formed.

The first terminal portion 11 is a rectangular flat plate and has a flat plate surface 111 and a flat plate surface 112 parallel to the xb-axis direction and the yb-axis direction. The thickness direction of the first terminal portion 11 is the zb-axis direction.

A plurality of through holes 101 are formed in the first terminal portion 11 . A plurality of through holes 101 are arranged in the xb-axis direction and the yb-axis direction. Three through-holes 101 are arranged in the yb-axis direction and two in the xb-axis direction. The plurality of through-holes 101 are arranged at intervals PL in the yb-axis direction and at intervals PW in the xb-axis direction. A first set and a second set of three through holes 101 arranged in the yb-axis direction are arranged in line with the center line of the first terminal portion 11 parallel to the yb-axis direction. Arranged in a symmetrical relationship. Note that the number and arrangement of the through holes 101 are not limited to this.

The second terminal portion 12 is a rectangular flat plate and has a flat plate surface 121 and a flat plate surface 122 parallel to the xb-axis direction and the yb-axis direction. That is, the zb-axis direction is the thickness direction of the second terminal portion 12 .

A plurality of through holes 102 are formed in the second terminal portion 12 . A plurality of through holes 102 are arranged in the xb-axis direction and the yb-axis direction. Three through-holes 102 are arranged in the yb-axis direction and two in the xb-axis direction. The arrangement pattern of the plurality of through holes 102 with respect to the second terminal portion 12 is the same as the arrangement pattern of the plurality of through holes 101 with respect to the first terminal portion 11 . The number and arrangement of through-holes 102 are not limited to this, but are the same as the number and arrangement of through-holes 101 .

The joint portion 13 is a rectangular flat plate and has a flat plate surface 131 and a flat plate surface 132 parallel to the xb-axis direction and the zb-axis direction. That is, the thickness direction of the joint portion 13 is the yb-axis direction. Thus, the flat plate surfaces 131 and 132 of the joint portion 13 are orthogonal to the flat plate surfaces 111 and 112 of the first terminal portion 11 and the flat plate surfaces 121 and 122 of the second terminal portion 12 .

The joint portion 13 is connected to one end of the first terminal portion 11 in the yb-axis direction and is connected to one end of the second terminal portion 12 in the yb-axis direction.

The first terminal portion 11 and the second terminal portion 12 overlap each other in plan view. At this time, the plurality of through holes 101 and the plurality of through holes 102 are positioned at the same position in plan view.

The flat plate surface 112 of the first terminal portion 11 and the flat plate surface 122 of the second terminal portion 12 face each other. Further, the flat plate surface 132 of the joint portion 13 faces the first terminal portion 11 and the second terminal portion 12 side.

The busbar 10 having such a shape can be formed, for example, from a single rectangular flat plate having a predetermined rigidity. The bus bar 10 can be formed by bending the flat plate at two locations in the longitudinal direction thereof at approximately 90 degrees.

(Configuration of power supply system)
FIG. 3 is a diagram showing part of the configuration of the power supply system according to the first embodiment of the present invention. FIG. 4 is a diagram showing a connection terminal forming portion in a battery module used in a power supply system. A connection terminal is, for example, a terminal to which a voltage is input or output. The connection terminals and the busbars are electrically connected. FIG. 5 is an enlarged view of the connection structure between the busbar and the connection terminal.

As shown in FIG. 3, the power system includes a power module 80, multiple battery modules, and multiple busbars. A plurality of battery modules correspond to the "power supply module" of the present invention. Here, as the plurality of battery modules, a battery module 81, a battery module 82, and a battery module 83 are provided, and as the plurality of bus bars, a power supply bus bar 71, a power supply bus bar 72, a bus bar 10A1, a bus bar 10A2, a bus bar 10B1, and a , an example with a busbar 10B2. The busbars 10A1 and 10A2 correspond to the "first busbar" of the present invention, and the busbars 10B1 and 10B2 correspond to the "second busbar" of the present invention.

The power module 80 , the battery module 81 , the battery module 82 , and the battery module 83 each have a rectangular parallelepiped housing and are arranged and installed on the rack 90 . More specifically, along the vertical direction (zs-axis direction), the power module 80, the battery module 81, the battery module 82, and the battery module 83 are arranged in this order from the top, with a predetermined distance from each other. .

The power module 80 internally includes a power supply circuit and the like. Each of the battery module 81, the battery module 82, and the battery module 83 has a capacitor or the like for power storage.

The power module 80 includes connection terminals 801 and 802 each having a flat plate shape. Each flat plate surface of the connection terminal 801 and the connection terminal 802 is perpendicular to the vertical direction (zs-axis direction). In other words, the connection terminal 801 and the connection terminal 802 are parallel to the xs-axis direction and the ys-axis direction. The connection terminal 801 and the connection terminal 802 are arranged at different positions in the xs-axis direction. The power module 80 is, for example, an AC-DC power converter that converts AC power input from an AC power supply into DC power and outputs it, or converts the voltage of DC power input from a DC power supply to generate another DC power. Includes a DC-DC power converter that converts and outputs

Battery module 81, battery module 82, and battery module 83 have the same configuration. However, the battery module 81, the battery module 82, and the battery module 83 may have at least the same connection terminal structure. The battery module includes, for example, a power supply module that contains a battery and outputs DC power.

The battery module 81 includes a connection terminal 811 and a connection terminal 812 each having a flat plate. More specifically, as shown in FIG. 4, the flat plate surfaces of the connection terminals 811 and 812 are orthogonal to the vertical direction (zs-axis direction). The connection terminal 811 and the connection terminal 812 are arranged at different positions in the xs-axis direction, and arranged at substantially the same positions in the ys-axis direction and the zs-axis direction. The connection terminal 811 and the connection terminal 812 have substantially the same shape as the first terminal portion 11 and the second terminal portion 12 of the bus bar 10 .

A plurality of through holes 891 are formed in the connection terminal 811 so as to penetrate the connection terminal 811 in the zs-axis direction. A plurality of through holes 892 are formed in the connection terminal 812 so as to penetrate the connection terminal 812 in the zs-axis direction. The formation pattern of the plurality of through holes 891 and the plurality of through holes 892 is the same as the formation pattern of the plurality of through holes 101 and the plurality of through holes 102 of the busbar 10 .

The battery module 82 includes flat connecting terminals 821 and 822, respectively. Each flat plate surface of the connection terminal 821 and the connection terminal 822 is orthogonal to the vertical direction (zs-axis direction). The configuration of the connection terminal 821 and the connection terminal 822 is the same as the configuration of the connection terminal 811 and the connection terminal 812, and detailed description thereof will be omitted.

The battery module 83 includes a connection terminal 831 and a connection terminal 832 each having a flat plate. Each flat plate surface of the connection terminal 831 and the connection terminal 832 is perpendicular to the vertical direction (zs-axis direction). The configuration of the connection terminal 831 and the connection terminal 832 is the same as the configuration of the connection terminal 811 and the connection terminal 812, and detailed description thereof will be omitted.

The connection terminal 811 of the battery module 81, the connection terminal 821 of the battery module 82, and the connection terminal 831 of the battery module 83 overlap each other in plan view (viewed in the zs-axis direction). In other words, the positions of the connection terminal 811, the connection terminal 821, and the connection terminal 831 in the xs- axis direction and the ys- axis direction are the same.

The connection terminal 812 of the battery module 81, the connection terminal 822 of the battery module 82, and the connection terminal 832 of the battery module 83 overlap each other in plan view (viewed in the zs-axis direction). In other words, the positions of the connection terminal 812, the connection terminal 822, and the connection terminal 832 in the xs- axis direction and the ys- axis direction are the same.

Furthermore, in the power supply system 1, the connection terminal 801 of the power module 80 overlaps the connection terminal 811 in plan view (seen in the zs-axis direction). In other words, the positions of the connection terminal 801 and the connection terminal 811 in the xs- axis direction and the ys- axis direction are the same. Further, in the power supply system 1, the connection terminal 802 of the power module 80 overlaps the connection terminal 812 in plan view (seen in the zs-axis direction). In other words, the positions of the connection terminal 802 and the connection terminal 812 in the xs- axis direction and the ys- axis direction are the same. Note that the positional relationship between the connection terminals of the power module 80 and the connection terminals of the battery modules 81, 82, and 83 is not limited to this relationship.

(Mode of connection between power module 80 and battery module 81)
Positive Electrode Side The connection terminal 801 of the power module 80 and the connection terminal 811 of the battery module 81 are connected by the power bus bar 71 . More specifically, the power bus bar 71 includes two terminal portions parallel to the xs-axis direction and the ys-axis direction, and a joint portion connecting them and extending in the zs-axis direction. One terminal portion of the power bus bar 71 faces and contacts the connection terminal 801 and is fixed by a plurality of bolts 99 inserted into the plurality of through holes. The other terminal portion of the power bus bar 71 faces the upper surface of the connection terminal 811 (the surface on the power module 80 side). Since the power supply bus bar 71 and the connection terminal 801 are in contact with each other, it is easy to fix the positional relationship between the two, and the work of fixing the bolt 99 is facilitated.

Negative Electrode Side The connection terminal 802 of the power module 80 and the connection terminal 812 of the battery module 81 are connected by the power bus bar 72 . More specifically, the power bus bar 72 includes two terminal portions parallel to the xs-axis direction and the ys-axis direction, and a joint portion connecting them and extending in the zs-axis direction. One terminal portion of the power bus bar 72 faces and contacts the connection terminal 802 and is fixed by a plurality of bolts 99 inserted into a plurality of through holes. The other terminal portion of the power bus bar 72 faces the upper surface of the connection terminal 812 (the surface on the power module 80 side).

(Mode of connection between battery module 81 and battery module 82)
The connection terminal 811 (corresponding to the "first connection terminal" of the present invention) of the positive electrode side battery module 81 and the connection terminal 821 (corresponding to the "second connection terminal" of the present invention) of the battery module 82 are connected by the bus bar 10A1. Connected. More specifically, as shown in FIG. 5 , the flat plate surface 112 of the first terminal portion 11 of the busbar 10A1 faces and contacts the power supply busbar 71 . That is, with respect to the connection terminal 811 , the other terminal portion of the power bus bar 71 is arranged in contact with the upper surface of the connection terminal 811 (corresponding to the “first surface” of the present invention). The first terminal portion 11 of the bus bar 10A1 is placed in contact with the other terminal portion of the bus bar 10A1. These connection terminals 811, the other terminal portion of the power bus bar 71, and the first terminal portion 11 of the bus bar 10A1 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

In the second terminal portion 12 of the bus bar 10A1, the flat plate surface 121 faces and contacts with the upper surface of the connection terminal 821 (the surface on the side of the battery module 81 with respect to the battery module 82 (corresponding to the “second surface” of the present invention)). . That is, the second terminal portion 12 of the busbar 10A1 is in direct contact with the connection terminal 821. As shown in FIG. A flat plate surface 112 of a first terminal portion 11 of a bus bar 10B1, which will be described later, faces and contacts the flat plate surface 122 of the second terminal portion 12. As shown in FIG. These connection terminals 821, the second terminal portion 12 of the busbar 10A1, and the first terminal portion 11 of the busbar 10B1 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

At this time, the busbar 10A1 is arranged such that the joint portion 13 is on the opposite side of the joint portion of the power busbar 71 in the xs-axis direction with respect to the connection terminal 811 .

The connection terminal 812 (corresponding to the "first connection terminal" of the present invention) of the negative electrode side battery module 81 and the connection terminal 822 (corresponding to the "second connection terminal" of the present invention) of the battery module 82 are connected by the bus bar 10A2. Connected. More specifically, the flat plate surface 112 of the first terminal portion 11 of the busbar 10A2 faces and contacts the power supply busbar 72 . The power bus bar 72 is in contact with the upper surface of the connection terminal 812 (corresponding to the “first surface” of the present invention). These connection terminals 812, the other terminal portion of the power bus bar 72, and the first terminal portion 11 of the bus bar 10A2 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

In the second terminal portion 12 of the bus bar 10A2, the flat plate surface 121 faces and contacts with the upper surface of the connection terminal 822 (one surface of the battery module 81 side of the battery module 82 (“second surface” in the present invention)). . That is, the second terminal portion 12 of the busbar 10A2 is in direct contact with the connection terminal 822. As shown in FIG. A flat plate surface 112 of a first terminal portion 11 of a bus bar 10B2, which will be described later, faces and contacts the flat plate surface 122 of the second terminal portion 12. As shown in FIG. These connection terminals 822, the second terminal portion 12 of the bus bar 10A2, and the first terminal portion 11 of the bus bar 10B2 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

At this time, the busbar 10A2 is arranged such that the joint portion 13 is on the opposite side of the joint portion of the power busbar 72 in the xs-axis direction with respect to the connection terminal 812 .

(Mode of connection between battery module 82 and battery module 83)
The connection terminal 821 of the positive electrode side battery module 82 (corresponding to the "second connection terminal" of the present invention) and the connection terminal 831 of the battery module 83 (corresponding to the "third connection terminal" of the present invention) are connected by the bus bar 10B1. Connected. More specifically, the flat plate surface 112 of the first terminal portion 11 of the busbar 10B1 faces the connection terminal 821 and the second terminal portion 12 of the busbar 10A1, and contacts the second terminal portion 12 of the busbar 10A1. That is, with respect to the connection terminal 821, the second terminal portion 12 of the bus bar 10A1 is arranged in contact with the upper surface of the connection terminal 821 (corresponding to the "second surface" of the present invention), and the second terminal portion 12 of the bus bar 10A1 is arranged. The first terminal portion 11 of the bus bar 10B1 is arranged on the portion 12 so as to abut thereon. That is, the first terminal portion 11 of the busbar 10B1 is indirectly in contact with the connection terminal 821. As shown in FIG. These connection terminals 821, the second terminal portion 12 of the busbar 10A1, and the first terminal portion 11 of the busbar 10B1 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

In the second terminal portion 12 of the bus bar 10B1, the flat plate surface 121 faces and contacts with the upper surface of the connection terminal 831 (the surface on the side of the battery module 82 with respect to the battery module 83 (corresponding to the “third surface” of the present invention)). . That is, the second terminal portion 12 of the busbar 10B1 is in direct contact with the connection terminal 831. As shown in FIG. These connection terminals 831 and the second terminal portion 12 of the bus bar 10B1 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

At this time, busbar 10B1 is arranged such that joint portion 13 is on the opposite side of the joint portion of busbar 10A1 in the xs-axis direction with connection terminal 821 as a reference.

The connection terminal 822 (corresponding to the “second connection terminal” of the present invention) of the negative electrode side battery module 82 and the connection terminal 832 (corresponding to the “third connection terminal” of the present invention) of the battery module 83 are connected by the bus bar 10B2. Connected. More specifically, the flat plate surface 112 of the first terminal portion 11 of the busbar 10B2 faces the connection terminal 822 and the second terminal portion 12 of the busbar 10A2, and contacts the second terminal portion 12 of the busbar 10A2. That is, with respect to the connection terminal 822, the second terminal portion 12 of the busbar 10A2 is arranged in contact with the upper surface of the connection terminal 822 (corresponding to the "second surface" of the present invention), and the second terminal portion 12 of the busbar 10A2 is arranged. The first terminal portion 11 of the bus bar 10B2 is arranged on the portion 12 in contact therewith. That is, the first terminal portion 11 of the bus bar 10B2 is indirectly in contact with the connection terminal 822. As shown in FIG. These connection terminals 822, the second terminal portion 12 of the bus bar 10A2, and the first terminal portion 11 of the bus bar 10B2 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

In the second terminal portion 12 of the bus bar 10B2, the flat plate surface 121 faces and contacts the upper surface of the connection terminal 832 (the surface on the side of the battery module 82 with respect to the battery module 83 (corresponding to the “third surface” of the present invention)). . That is, the second terminal portion 12 of the busbar 10B2 is in direct contact with the connection terminal 832. As shown in FIG. These connection terminals 832 and the second terminal portion 12 of the bus bar 10B2 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

At this time, the busbar 10B2 is arranged such that the joint portion 13 is on the opposite side of the joint portion of the busbar 10A2 in the xs-axis direction with respect to the connection terminal 822 .

Thus, in the configuration of the present embodiment, the plurality of battery modules 81, 82, 83 consisting of three or more are connected by the plurality of bus bars 10A1, 10A2, 10B1, 10B2. The plurality of busbars 10A1, 10A2, 10B1 and 10B2 have the same shape. Thereby, the operator can easily connect the plurality of battery modules 81 , 82 , 83 .

In particular, since the plurality of bus bars 10A1, 10A2, 10B1, and 10B2 have a shape having a recess formed by bending a flat plate at two locations, the direction of the recess is sequentially reversed, so that they are arranged at equal intervals. Multiple connection terminals can be easily connected.

Further, in this configuration, the connecting portions of the busbars 10A1, 10A2, 10B1 and 10B2 and the connecting surfaces of the connecting terminals of the battery modules 81, 82 and 83 are perpendicular to each other in the vertical direction. Accordingly, when fixing the busbars 10A1, 10A2, 10B1, 10B2 to the connection terminals of the battery modules 81, 82, 83 with the bolts 99, the operator only needs to insert the bolts 99 into the through holes from above. Therefore, the fixing work can be facilitated, and the falling of the bolt 99 during the fixing work can be suppressed.

Moreover, since there is only one type of bus bar shape, the cost of the power supply system 1 can be reduced, and the operator can easily perform the connection work without hesitation.

In this configuration, the busbars 10A1 and 10B1 are directly connected, and the busbars 10A2 and 10B2 are directly connected. As a result, the current path can be prevented from becoming unnecessarily long, and the current transmission loss can be suppressed.

Also, in this configuration, the busbars are fixed to the connection terminals in the order of the busbars closest to the power module 80 . Therefore, an additional busbar can be easily installed when a new battery module is added.

(Another aspect of the connection configuration of the power supply system)
FIG. 6 is a diagram showing part of another configuration of the power supply system according to the first embodiment of the present invention. As shown in FIG. 6, the power supply system 1A according to the first embodiment differs from the power supply system 1 according to the first embodiment in the connection mode on the negative electrode side. The rest of the configuration of the power supply system 1A is the same as that of the power supply system 1, and the description of the same portions will be omitted.

In the power supply system 1A, the connection terminal 802 of the power module 80 and the battery module 81 are connected by the power bus bar 72A. The power bus bar 72A is arranged such that the joint portion is on the opposite side of the connection terminal 801 with respect to the connection terminal 802 .

In this case, the busbar 10A2 is arranged so that the joint portion 13 is on the connection terminal 811 side with the connection terminal 812 as a reference. Also, the bus bar 10B2 is arranged such that the joint portion 13 is on the opposite side of the connection terminal 821 with respect to the connection terminal 822 .

Thus, by using the configuration of the present invention, it is possible to easily connect the plurality of battery modules 81, 82, 83 by adjusting the arrangement of the plurality of busbars according to the arrangement of the power supply busbars. That is, the plurality of battery modules 81, 82, 83 can be easily connected without changing the shape of the busbar according to the arrangement of the power busbar.

(Second embodiment)
A configuration of a bus bar in a power supply system according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a five-sided view of the bus bar according to the second embodiment. 7(A) is a first plan view, FIG. 7(B) is a first side view, FIG. 7(C) is a second plan view, and FIG. 7(D) is a second plan view. 2 side views, and FIG. 7(E) is a third side view.

As shown in FIG. 7, the busbar 10A according to the second embodiment differs from the busbar 10 according to the first embodiment in the configuration of joint portions 13A. The rest of the configuration of the busbar 10A is the same as that of the busbar 10, and the description of the similar portions will be omitted.

The joint portion 13A has a plurality of bent portions CV. That is, the joint portion 13A has a so-called clamp shape and corresponds to the "adjustment portion" of the present invention. With such a configuration, the joint portion 13A can adjust the distance between the first terminal portion 11 and the second terminal portion 12 by an external force. As a result, even if the distance between the connection terminals of the adjacent battery modules varies, the connection terminals of the plurality of battery modules can be more reliably connected to each other.

In the busbar 10A, the joint portion 13A has a plurality of bent portions CV so as to be recessed toward the first terminal portion 11 and the second terminal portion 12 (surface 132A side). However, the joint portion 13A may have a shape that is recessed (expands outward) toward the surface 131A. However, the clamp shape can be realized without changing the size of the outermost shape of the bus bar 10A by making the shape recessed toward the surface 132A.

Also, in the above description, a mode in which the adjustment portion is realized by the shape of the clamp has been shown. However, any structure that can adjust the distance between the first terminal portion 11 and the second terminal portion 12 can be applied to the joint portion 13A without being limited to the shape of the clamp.

FIG. 8 is a diagram illustrating an example of a connection mode of busbars according to the second embodiment.

As shown in FIG. 8, the power supply system 1B according to the second embodiment replaces the busbar 10A1 of the power supply system 1 according to the first embodiment shown in FIG. different in that The rest of the configuration of the power supply system 1B is the same as that of the power supply system 1, and the description of the same portions will be omitted.

Busbar 10A11 and busbar 10A21 have the configuration of busbar 10A.

• Positive Electrode Side The connection terminal 811 of the battery module 81 and the connection terminal 821 of the battery module 82 are connected by the bus bar 10A11. As shown in FIG. 8, more specifically, the flat plate surface 112 of the first terminal portion 11 of the busbar 10A11 faces and contacts the power supply busbar 71 . That is, the other terminal portion of the power bus bar 71 is placed on the connection terminal 811 so as to abut on the connection terminal 811, and the second terminal portion of the bus bar 10A11 is placed on the other terminal portion of the power bus bar 71. 1 terminal portion 11 is arranged in contact therewith. These connection terminals 811, the other terminal portion of the power bus bar 71, and the first terminal portion 11 of the bus bar 10A11 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

The flat plate surface 121 of the second terminal portion 12 of the bus bar 10A11 faces and contacts the upper surface of the connection terminal 821 (the surface on the battery module 81 side with respect to the battery module 82). A flat plate surface 112 of a first terminal portion 11 of a bus bar 10B1, which will be described later, faces and contacts the flat plate surface 122 of the second terminal portion 12. As shown in FIG. These connection terminals 821, the second terminal portion 12 of the busbar 10A11, and the first terminal portion 11 of the busbar 10B1 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

At this time, the busbar 10A11 is arranged such that the joint portion 13 is on the opposite side of the joint portion of the power busbar 71 in the xs-axis direction with respect to the connection terminal 811 .

Negative Electrode Side The connection terminal 812 of the battery module 81 and the connection terminal 822 of the battery module 82 are connected by the bus bar 10A21. More specifically, the flat plate surface 112 of the first terminal portion 11 of the bus bar 10A21 faces and contacts the power bus bar 72 . These connection terminals 812, the other terminal portion of the power bus bar 72, and the first terminal portion 11 of the bus bar 10A21 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

The flat plate surface 121 of the second terminal portion 12 of the bus bar 10A21 faces and contacts with the upper surface of the connection terminal 822 (the surface on the battery module 81 side with respect to the battery module 82). A flat plate surface 112 of a first terminal portion 11 of a bus bar 10B2, which will be described later, faces and contacts the flat plate surface 122 of the second terminal portion 12. As shown in FIG. These connection terminals 822, the second terminal portion 12 of the busbar 10A21, and the first terminal portion 11 of the busbar 10B2 are fixed by a plurality of bolts 99 that are inserted through the plurality of through holes.

At this time, the busbar 10A21 is arranged such that the joint portion 13 is on the opposite side of the joint portion of the power busbar 72 in the xs-axis direction with respect to the connection terminal 812 .

Thus, in the power supply system 1B, the plurality of battery modules 81 and 82 are connected using the busbars 10A11 and 10A21 having the shape of the busbar 10A, and the busbars 10B1 and 10B2 having the shape of the busbar 10 are used to A plurality of battery modules 82, 83 are connected.

Therefore, the power supply system 1B has the first terminal portion 11 and the second terminal portion 12, and if the positional relationship between the first terminal portion 11 and the second terminal portion 12 is the same, the shapes of the joint portions are different. However, it can be used as a similar bus bar to connect a plurality of battery modules 81, 82, 83.

Strictly speaking, the power supply system 1B has a different shape, but by using similar busbars in the concept described above, a more diverse connection mode can be achieved according to the arrangement of the plurality of battery modules 81, 82, and 83. realizable.

In addition, in the present embodiment, the bus bars having the same shape are used on the positive electrode side and the negative electrode side. However, bus bars having different shapes may be used on the positive electrode side and the negative electrode side.

(Third embodiment)
A configuration of a busbar in a power supply system according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a five-sided view of the bus bar according to the third embodiment. 9(A) is a first plan view, FIG. 9(B) is a first side view, FIG. 9(C) is a second plan view, and FIG. 9(D) is a second plan view. It is two side views, and FIG.9(E) is a 3rd side view.

As shown in FIG. 9, the busbar 10B according to the third embodiment differs from the busbar 10 according to the first embodiment in that an insulating film 20 is added. The rest of the configuration of the busbar 10B is the same as that of the busbar 10, and the description of the similar portions will be omitted.

The busbar 10B has an insulating film 20 . The insulating film 20 covers the entire surface of the joint portion 13 . Furthermore, the insulating film 20 covers the connection portion to the joint portion 13 in the first terminal portion 11 and a region near the connection portion, and the connection portion to the joint portion 13 in the second terminal portion 12 and a region near the connection portion. cover.

With such a configuration, the busbar 10B can prevent the joint portion 13 from being short-circuited with another circuit component or the joint portion 13 of another busbar. As a result, a highly reliable power supply system can be realized.

The insulating film 20 may be formed at least on the flat plate surface 131 side of the joint portion 13 . As a result, at least the effect of suppressing short circuits with external circuit components and other bus bars can be obtained to a considerable degree.

In the above description, the shape of the power supply bus bar connecting the power module 80 and the battery module 81 is similar to the shape of the bus bar connecting a plurality of battery modules. However, the shape of the power supply bus bar can be appropriately set according to the relationship between the arrangement positions of the power modules 80 and the battery modules 81, the manner of installation on the rack 90, and the like. For example, the power supply bus bar may have other shapes such as an L-shape. can be easily connected to other battery modules.

Moreover, the configurations of the above-described embodiments can be appropriately combined, and effects can be obtained according to each combination.

1, 1A, 1B: power supply system 10, 10A, 10A1, 10A2, 10A11, 10A21, 10B, 10B1, 10B2: bus bar 11: first terminal portion 12: second terminal portion 13, 13A: joint portion 20: insulating film 71 , 72, 72A: Power supply bus bar 80: Power modules 81, 82, 83: Battery module 90: Rack 99: Bolts 101, 102: Through holes 111, 112, 121, 122, 131, 132: Flat plate surfaces 131A, 132A: Surfaces 801, 802: Connection terminals 811, 812, 821, 822, 831, 832: Connection terminals 891, 892: Through holes CV: Bending portion

Claims (10)

a plurality of power supply modules arranged in order of a first power supply module, a second power supply module, and a third power supply module in a predetermined direction;
a first bus bar connecting the first power supply module and the second power supply module;
a second bus bar connecting the second power supply module and the third power supply module;
with
The first power supply module includes a first connection terminal having a first surface orthogonal to the predetermined direction,
The second power supply module includes a second connection terminal having a second surface orthogonal to the predetermined direction,
The third power supply module includes a third connection terminal having a third surface perpendicular to the predetermined direction,
The first bus bar and the second bus bar are
a first terminal portion and a second terminal portion having a pair of surfaces facing each other;
a joint portion that connects the first terminal portion and the second terminal portion such that the surface of the first terminal portion and the surface of the second terminal portion face each other;
for each,
In the first bus bar, the surface of the first terminal portion of the first bus bar is in contact with the first surface of the first connection terminal, and the surface of the second terminal portion of the first bus bar is in contact with the second connection terminal. arranged so as to be in direct or indirect contact with the second surface,
In the second bus bar, the surface of the first terminal portion of the second bus bar is in direct or indirect contact with the second surface of the second connection terminal, and the surface of the second terminal portion of the second bus bar is in contact with the second surface of the second connection terminal. arranged to directly or indirectly connect to the third surface of the third connection terminal;
In a direction parallel to the first surface, the joint portion of the first bus bar and the joint portion of the second bus bar are arranged at positions sandwiching the first connection terminal, the second connection terminal, and the third connection terminal. to be
power system. a surface of the second terminal portion of the first bus bar and a surface of the first terminal portion of the second bus bar are opposed to each other,
The power system of claim 1. The predetermined direction is a vertical direction,
The surface of the first terminal portion, the surface of the second terminal portion, and the third surface are perpendicular to the vertical direction,
The power supply system according to claim 1 or 2. the joint portion of the first bus bar and the joint portion of the second bus bar connecting the plurality of power supply modules have the same length in the predetermined direction;
The surface of the first terminal portion is in direct contact with the connection terminals of the plurality of power supply modules, and the surface of the second terminal portion is in direct contact with the connection terminals of the plurality of power supply modules.
The power supply system according to any one of claims 1 to 3. a plurality of battery modules including the first power module, the second power module, and the third power module;
a power module arranged in the predetermined direction and arranged next to the first power supply module or the third power supply module;
a power module bus bar that connects the power module and one of the plurality of battery modules;
with
The length of the joint portion of the first busbar and the joint portion of the second busbar in the predetermined direction is different from the length of the joint portion of the power module busbar in the predetermined direction.
The power supply system according to any one of claims 1 to 4. The joint portion includes an adjustment portion that can adjust the distance between the first terminal portion and the second terminal portion,
The power supply system according to any one of claims 1 to 5. The adjusting portion has a clamp shape formed in the joint portion,
7. The power system of claim 6. An insulating film disposed on the surface of the joint portion,
The power supply system according to any one of claims 1 to 7. The insulating film is
a shape that covers at least the entire surface of the joint portion opposite to the side on which the first terminal portion and the second terminal portion are arranged;
9. The power system of claim 8. a plurality of connection terminals arranged in order of a first connection terminal, a second connection terminal, and a third connection terminal in a predetermined direction;
a first bus bar connecting the first connection terminal and the second connection terminal;
a second bus bar that connects the second connection terminal and the third connection terminal;
with
The first connection terminal has a first surface orthogonal to the predetermined direction,
The second connection terminal has a second surface orthogonal to the predetermined direction,
The third connection terminal has a third surface orthogonal to the predetermined direction,
The first bus bar and the second bus bar are
a first terminal portion and a second terminal portion having a pair of surfaces facing each other;
a joint portion that connects the first terminal portion and the second terminal portion such that the surface of the first terminal portion and the surface of the second terminal portion face each other;
for each,
In the first bus bar, the surface of the first terminal portion of the first bus bar is in contact with the first surface of the first connection terminal, and the surface of the second terminal portion of the first bus bar is in contact with the second connection terminal. arranged so as to be in direct or indirect contact with the second surface,
In the second bus bar, the surface of the first terminal portion of the second bus bar is in direct or indirect contact with the second surface of the second connection terminal, and the surface of the second terminal portion of the second bus bar is in contact with the second surface of the second connection terminal. arranged to directly or indirectly connect to the third surface of the third connection terminal;
In a direction parallel to the first surface, the joint portion of the first bus bar and the joint portion of the second bus bar are arranged at positions sandwiching the first connection terminal, the second connection terminal, and the third connection terminal. to be
A connection structure between a connection terminal and a bus bar.

Images